In the notes that follow the story Christopher Tolkien points out how that his father not only wanted to emphasize the drastic difference between hobbits and drúedain in physical appearance, but also wanted to differentiate the magic of the drúedain from that of dwarves. This story is an illustration of the faithfulness of drúedain, as the title says and their magic - how drûgs are capable of transferring power to an object they made. This story may also strike some as a miniature version of Sauron's transfer of power to artifacts such as the One Ring and the foundation of Barad-dûr.[1]

The story set in the first age is about the drûgAghan a great friend of Barach, a forester of the people of Haleth. When raiding orcs entered the forest, Aghan started to guard Barach's home which was two miles away from the nearest village. But Aghan had to leave Barach's house for some days to aid his injured brother as he was a skilled leech and knew the remedies to orc poison. He left behind a "watch-stone": a figure carved in the shape of a Drúadan to guard Barach's house.

While Aghan was away, Barach's house was attacked by orcs who attempted to set it ablaze, but they were beaten off by a mysterious drûg. The drûg turned out to be the watch-stone to which Aghan had transferred some of his power. The legs of the statue were mutilated during the defense. Aghan suffered blistered legs around the same time as the watch-stone had defended Barach's house from the raiding orcs. The story ends with Aghan's words "Alas! If some power passes from you to a thing that you have made, then you must take a share in its hurts."